Trap for waste-water pipes.



No. 893,791. PATENTED JULY 21, 1908.

W. J. FROST.

TRAP FOR WASTE WATER PIPES.

APPLICATION FILED MAY 2, 190B.

I In i027 WALTER J. FROST, OF KENOSHA, WISCONSIN.

TRAP FOR WASTE-WATER PIPES.

Specification of Letters Patent.

Application filed May 2, 1908.

Patented July 21, 1908. Serial No. 430,447.

To all whom it may concern:

Be it known that I, WALTER J. FROST, a citizen of the United States, residing at Kenosha, in the county of Kenosha and State of Wisconsin, have invented certain new and useful Improvements in Traps for Waste- Water Pipes, of which the following is a specification.

This invention relates to improvements in traps for waste water pipes, and it has for its salient object to provide a construction which while extremely compact effectually prevents siphon action and insures a reliable sealing of the trap; to provide a construction which may be very economically formed from sheet metal, and to provide a construction which is both strong and presents a neat and ornamental appearance.

To the above ends the invention consists in the matters hereinafter described, and more particularly pointed out in the appended claims.

In the drawing-Figure 1 is a view showing the invention applied to a wash basin Fig. 2 is an axial sectional view of the trap proper. Fig. 3 is a horizontal sectional view taken on line 3 3 of Fig. 2 and looking downwardly.

Referring to the drawing, 1 designates the descending or inlet limb, 2 the ascending or outlet limb, and 3 as a whole the bulbous trap chamber with which the two limbs communicate. Said chamber in the preferred construction shown comprises an upper sub stantially hemispherical member 4 provided with two integral upstanding pipe stubs or nipples 5 and 6, arranged to rise with their axes parallel with each other and disposed at diametrically opposite sides of the hemisphere. The lower member 3 may be and is herein shown as a plain hemispherical member and the two members 3 and 4 are conveniently united by an interfolded or interlocked beaded joint 7.

In practice the members 3 and 4 are drawn up from suitable blanks by means of suitable drawing dies. The nipple 5 is made of suitable diameter to permit the lower end of the inlet limb 1 to telescope and extend therein to a point below the horizontal middle of the chamber, and said inlet limb is desirably provided with an external bead 8 which serves to limit and determine the extent of its insertion. The nipple 6 desirably terminates in an externally threaded flange 9 which is engaged by a union nut 10 internally conformed to receive a gasket ring 11 which serves the double function when compressed of sealing the union between the extension pipe 2 and the nipple, and also of joining said parts together.

It is to be particularly observed that the cross sectional area and capacity of that part of the bulbous trap chamber above the discharge end of the inlet limb is very consider ably greater than the cross sectional area of the inlet. In other words, this trap chamber constitutes an abrupt enlargement of the passage through the trap. In order to economize in room, and at the same time afford a construction which may be economically manufactured, the upper part of the bulbous chamber is so arranged as to substantially encircle and inclose the lower end of the inlet limb, and this enables the outlet limb to be brought as closely alongside of the inlet limb as desired.

The manner in which the construction described operates to reliably prevent siphoning action to such extent as to unseal the trap is believed to be substantially as follows: Inasmuch as the outlet limb communicates with the highest part of the trap chamber, the latter will be completely filled with liquid during the flushing flow, and if the column is sufliciently unbroken so as to inaugurate siphoning it will be obvious that the level in the inlet limb will descend until it reaches the lower end of the inlet. Thereupon air will pass from the lower end upwardly through the trap chamber to theupper bend or highest point of the outletlimb,

and this will, of course, break the siphoning action at a time when the trap chamber is substantially full of liquid as to all of its parts except the space inside of the inlet limb. Of

course, when the siphoning action is broken the liquid will divide and substantially all that is contained in the chamber and the rising part of the outlet limb will settle back into the lower part of the chamber, and this will be amply suflicient to seal the inlet to a substantial depth. Of course, owing to momentum and molecular friction a certain proportion of the liquid in the trap and rising part of the outlet limb will be carried over, due to the rush of liquid through the trap, but this rushing out action will be minimized owing to the eddying currents which will exist inside of the trap due to its relatively large capacity as compared with the inlet and its arrangement relatively to the latter.

In other words, the liquid does not flow as an uninterrupted column from the inlet limb to the outlet limb, but the action is rather analogous to that where a pipe leads into one side of a tank and an outlet pipe conducts the water away from a part comparatively remote from the inlet. The unobstructed interior of the chamber which permits this eddying circulation is therefore'a factor in the reliable operation of the trap.

From the foregoing it will be understood that the invention is not limited to the precise construction shown, although this construction possesses several advantages peculiar to itself.

I claim as my invention:

1. A trap comprising a hemispherical top having two integral tubular nipples rising therefrom, adapted for connection with the respective inlet and outlet limbs, a hemispherical bottom joined to said top and forming in conjunction with the latter a bulbous wardly through one of said nipples to a point below the horizontal middle of said spherical chamber, and an outlet limb connected with -the-other of said nipples.

2. A trap comprising a hemispherical top, having formed integrally therewith two tubular nipples having their axes substantially parallel, located at diametrically opposite sides of the hemisphere, a hemispherical bot tom joined to the said topand forming in conjunction with the latter a spherical chamber, an inlet limb having its lower end telescoped within one of said nipples and eX- tending downwardly within the chamber to a point below the horizontal middle of the chamber, and an outlet limb connected with the upper end of said other nip le.

WALTER J. FROST.

Witnesses:

ALBERT H. GRAVES,

EMILIE RosE.

trap chamber, an inlet limb extending in- 

